First off, rock n’ roll was heavily popular since the 50’s; you had Chubby Checker, Buddy Holly, Chuck Berry, Little Richard, and…of course…Elvis Presley. These artists are the ones that took backstreet-bar blues and turned it into the mainstream media that it is today. Without them, you would not have The Beatles of the 60’s, which were the creators of Pop Rock and purveyors of Psychedelic Rock, nor the explosion of genres in the 80’s.
Secondly, the synthesizer was a creation of Mr. Moog in 1965, who sold complete and kit form Theremins prior